Restore limit when searching for searching for wizard name

20cdba7a1bf3 removed the limit but it is still needed to extract the single
record.

Closes #14238
(grafted from 303d517654fcbee0369a27e752e312bd9b722d1c)

--HG--
branch : 7.0

trytond/trytond/ir/action.py

@@ -1095,7 +1095,8 @@ class ActionWizard(ActionMixin, ModelSQL, ModelView):
                     ('model', '=', None),
                     ],
                 ],
-            order=[('model', 'ASC NULLS LAST')])
+            order=[('model', 'ASC NULLS LAST')],
+            limit=1)
         if actions:
             action, = actions
             return action.name